TO - I think there are several issues...one is the actual sound of the music, the feeling you get while listening to it, and of course, the lyrics.
Another aspect is on a deeper level - It seems to be a bit of a controversial topic, but there is a concept that music comes from deep in a person's soul - and so, whatever is deep in that person's souls will seep into the music. Then, that energy in the music touches us on a very deep level in our souls. So, we have to ask, do we want that energy, that stuff, in our souls?
As an aside, the classical composers were not very good people.
I have rabbeim that I'm close to that hold that it's not a problem. However, that is one of the issues that some of the people here are discussing.
I have to agree with you, though - if the sound of "jewish" music is krum, and is the type of sound that has sexual energy, etc - I'd say that's worse.
That's just my opinion, though.